Privacy policy

1. Controller

The person responsible for processing personal data on Clevercalc is:

You may send privacy enquiries and requests to exercise your rights to the email address above.

2. Scope and data categories

Clevercalc processes data needed to operate the website, provide features you choose, fund the service through Google AdSense or answer a contact request. This may include technical connection and device data, locally stored preferences, advertising and consent identifiers, data from an optional currency request and information you send by email.

No user accounts are created and no payment data is collected. Values entered into calculators are not sent to Google AdSense and are not used for advertising or profiling. AdSense may, however, process technical usage data and identifiers for the purposes described in the “Google AdSense” section. Clevercalc does not request sensitive personal data for server-side processing.

3. Calculators, PDF feature and Koda

Values entered into calculators — including health, fitness, finance or property calculator details — are normally processed exclusively by code in your browser. They are not sent to the operator or hosting provider and are not stored permanently. The only exception is the rate request described in the “Currency calculator” section.

Individual result PDFs and combined PDFs are generated exclusively in your browser. No calculator values are sent to an external PDF service. Only when you select “Add to PDF collection” does Clevercalc store the displayed inputs, results, calculator name and time locally on your device. You can remove individual entries at any time under “My results”.

Koda is a free, local, rule-based assistant for calculator search, simple arithmetic and short conversations. Koda does not use the OpenAI API or another external AI chat service. Your Koda messages remain in the memory of the open page, are not transmitted and disappear when the page is reloaded or closed.

Legal bases at a glance

4. Local storage and cookies

Clevercalc stores your selected language and the identifiers of your favourites and recently used calculators in your browser's local storage. Only when you explicitly add a result to the PDF collection are the displayed inputs, result, calculator name and time also stored locally. Session storage records only whether Koda's welcome message has already appeared.

These entries enable features you expressly request. You can remove results individually under “My results”; all local entries can also be deleted through your browser's website data. If storage is blocked, favourites, history, language memory, the PDF collection or the Koda notice may not work fully.

For the installable app, a service worker stores technically necessary public site files and previously opened pages in the browser cache. This enables faster loading and limited offline use. Calculator inputs are neither transmitted to the operator nor stored in the app cache. You can delete the cache through your device's website or app data.

The hosting platform may use technically necessary cookies or similar technologies for security, access protection and website delivery. Google AdSense may also use cookies, local storage or similar identifiers for ads, measurement and abuse prevention. Where consent is required, a Google-certified consent management platform controls this processing according to your choice.

5. Hosting by ChatGPT Sites

The website is hosted through ChatGPT Sites by OpenAI. Under the ChatGPT Sites terms, the contracting entity for operators outside the European Economic Area and Switzerland is OpenAI OpCo, LLC, USA. OpenAI processes hosting data as a processor to deliver, maintain and secure the website.

Technical log, usage and device data may be generated automatically when the site is accessed. This can include the IP address, time, requested page, browser and device type, operating system, referrer — if supplied by the browser — and status or security signals. It is used only for delivery, stability, troubleshooting, abuse prevention and security. Clevercalc does not create its own advertising or usage profile from it.

6. Google AdSense

Clevercalc uses Google AdSense, an advertising service provided by Google. The advertising code loads on the homepage, calculator pages and guides. Error pages, legal notices and shared result links containing inputs are excluded. A meta tag also enables site verification. Ads may be delivered after Google approves the site. The responsible Google entity may vary by location and contractual relationship.

When the AdSense code loads, your browser may connect to Google domains such as pagead2.googlesyndication.com. Google may receive the IP address, time, page viewed and referrer, browser and device information, consent signals, cookie or advertising identifiers, and information about ad views and interactions. This data may be used for website verification, ad delivery, reach measurement, billing, fraud and abuse prevention and — only within the scope of your choice — advertising personalisation.

Where required by law, choices regarding cookies, similar technologies and personalised advertising are collected through a Google-certified consent management platform. You can consent, decline or manage individual purposes there. Consent is voluntary and can be changed or withdrawn for the future through the privacy options provided by the platform. Calculator use does not depend on consenting to personalised advertising.

Google may also process data in the United States and other countries, using the contractual and other safeguards it states are available. Retention periods depend on the data type, purpose, your choices and Google's rules. Clevercalc does not receive values you enter into calculators; the operator may only receive advertising and performance reports in the AdSense account.

7. Currency calculator and Frankfurter

Only when you start a currency conversion does your browser connect to Frankfurter's public API. Only the source and target currency codes are transmitted. The amount you enter remains in your browser and is multiplied there by the retrieved reference rate. As with any direct internet connection, the service also technically receives connection data such as your IP address and standard browser headers.

Frankfurter states that the API itself does not collect personal data; however, the public service runs behind Cloudflare, which may collect basic information for analytics and security. Clevercalc receives only the reference rate and rate date and does not create a user profile from it. If you do not want this connection, do not use the currency calculator; all other calculators remain unaffected.

8. Contact by email

If you contact us by email, we process the information you voluntarily provide, particularly your email address, name, message content and any attachments. It is processed to handle and answer your request and, where necessary, to prepare or perform a contractual relationship.

Communications are processed through the operator's Yahoo email service. Please do not send health data, payment data, identity documents or other particularly confidential information by email unless strictly necessary and agreed in advance.

9. Share and copy functions

The “Share calculation” feature uses your device's native share function where available. Only when you select it does your browser pass the page title and link to the service you choose. If native sharing is unavailable, only the link is copied to the clipboard. Clevercalc does not independently transmit data to social networks.

10. Recipients and international processing

Recipients of personal data may include — only where necessary — OpenAI and its subprocessors for hosting and security, Google and its service providers for AdSense, Frankfurter and its infrastructure provider Cloudflare during a currency request, the email provider used, and public authorities where legally required.

Because the infrastructure is international, processing may take place particularly in Mexico, the United States and other countries. Where required, processor relationships and international transfers rely on the providers' contractual safeguards and guarantees available under applicable law. The operator does not sell or rent personal data. Data is transferred to Google for AdSense only for the advertising purposes described and — where required — in accordance with your consent choices.

11. Retention

Local browser data, including an explicitly saved PDF collection, remains on your device until you remove it or reset website data or the browser. Koda's session notice generally ends with the browser session. Clevercalc does not maintain its own database of calculator values, favourites, PDF results or chat messages.

Technical hosting data is processed only for as long as needed for delivery, security, abuse prevention and contractual or legal obligations; specific periods depend on the hosting provider's settings and requirements. AdSense data, cookies and identifiers are retained for the periods set by Google or displayed in the consent manager; you can delete browser data at any time. Email communications are deleted after the request is completed unless legal retention duties or legitimate reasons require further storage.

12. Your privacy rights

Depending on applicable law, you may request access, rectification, erasure or cancellation, restriction of processing, data portability and objection. You may withdraw consent at any time for the future. Under Mexican law, you particularly have the ARCO rights of Acceso, Rectificación, Cancelación and Oposición, as well as the right to limit the use or disclosure of your data.

Send your request with the subject “Privacy” or “Privacidad” to the email address above. Include your full name, a way for us to reply, the right you wish to exercise, the data concerned and any information that helps locate it. Where necessary, we may request suitable proof of identity; unnecessary details may be redacted. Requests are handled free of charge and within statutory time limits unless applicable law permits otherwise.

You also have the right to complain to the competent data protection authority. This may be the competent Mexican privacy authority or, where the GDPR applies, an authority in the EU Member State of your residence, workplace or the alleged infringement.

13. Security and minors

The website is transmitted over encrypted HTTPS. Local calculations and data minimisation deliberately reduce the amount of information transferred. No internet service can guarantee absolute security, however.

Clevercalc is not designed to collect personal data from children. Minors should not send personal or confidential information by email and should use the website only with the consent or supervision of a parent or guardian where required by the law of their residence.

14. Changes to this notice

This privacy policy will be updated if features, providers or legal requirements change. The current version is always published on this page, and the date at the top shows the latest revision. Additional analytics, advertising or other consent-based technologies will be used only after this notice has been updated accordingly and — where required — your consent has been obtained.